<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <link rel="stylesheet" href="popup.css" />
  </head>
  <body>
    <div class="container">
      <h1>Hello Extension</h1>
      <button id="getText">获取页面文本</button>
      <div id="output"></div>
    </div>
    <script src="popup.js"></script>
  </body>
</html>
